Development of a resonant excitation coil of AC magnetometer for evaluation of magnetic fluid

• Main Authors: Mohd Mawardi, Saari, Nazatul Sharreena, Suhaimi, Saifudin, Razali, Nurul Akmal, Che Lah, Sakai, Kenji, Kiwa, Toshihiko, Tsukada, Keiji
• Format: Article
• Language: English
• Published: Universiti Teknikal Malaysia Melaka (UTeM) 2018
• Subjects: Q Science (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/20627/1/Development%20of%20A%20Resonant%20Excitation%20Coil%20of%20AC%20Magnetometer%20for%20Evaluation%20of%20Magnetic%20Fluid.pdf; http://umpir.ump.edu.my/id/eprint/20627/; http://journal.utem.edu.my/index.php/jtec/article/view/3339/2402

A high-homogeneity excitation coil with a resonant circuit for AC magnetometer is developed. A solenoid coil is designed to produce a high-homogeneity and strong excitation field using a resonant frequency method. The solenoid coil is fabricated with a Litz wire to suppress the increase of AC resistance due to the skin and proximity effects in the high-frequency region. The Litz wire is composed of 60 strands of copper wires with 0.1-mm diameter. The resonant frequency method is applied to cancel the reactance component by connecting the excitation coil with a capacitor in a series configuration. To enable excitation of the magnetic field at multiple frequencies, a resonant circuit consists of multiple values of resonant capacitors is constructed. The fabricated excitation coil showed a high homogeneity of the magnetic field and was able to maintain a constant resonant current up to 32.5 kHz.